JP2003266128A - Electrically-driven bending tool - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electrically-driven bending tool to bend a bar such as a reinforcing bar with feeling skill close to that of a hand tool. <P>SOLUTION: An outer frame of a body comprises a housing 6 to accommodate a motor 1, a gear cover 4 to accommodate gear trains 7-12, and a cover 49 to accommodate a fixing member 19 or the like between the gear cover 14 and itself. A handle 46 extending to the housing 6 and the gear cover 14 is provided, and a main switch 41 to open/close a power supply path to the motor 1 is accommodated in the handle 46. The main switch 41 is a speed control switch to change the power supply according to the pulling degree of a trigger, and the handle 46 is located on the outer side in a range of bending a work. <P>COPYRIGHT: (C)2003,JPO

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the construction of houses and buildings,
Bars and pipes, such as reinforcing bars, for exterior construction and civil engineering
Portable electric bending tool that can bend any workpiece
It is about. Hereinafter, the work material will be described as a reinforcing bar.
You. 2. Description of the Related Art Residential foundations, external block walls, and building
Reinforced concrete and other concrete structures for civil engineering work
Uses a lot of reinforcing steel as reinforcement for concrete
You. Standard diameter of 10, 13, 16, 19, 22mm
Reinforcing bars of the specified dimensions are usually marketed on a fixed length of about 5m.
And cut it into predetermined lengths based on the architectural drawings.
Or bend at a predetermined angle and assemble with the binding wire 74 etc.
I have. FIG. 5 shows a state of a reinforcing bar used for a foundation of a house.
You. Cut the reinforcing bar 72 having a diameter of 10 mm to a length of
When used in an L-shape at 0 degrees, a reinforcing bar with a diameter of 13 mm
After cutting 73 to about 1.2m, the upper end is 180 degree U-shaped
When using in a bent shape, cut and bend the pattern to use.
Various. Tools used for these cutting and bending operations
Can cut the rebar to any length, and
It is necessary to bend at any angle up to 80 degrees
You. [0004] Conventional cutting and bending operations require a large amount
Cutting and bending with a large dedicated machine.
They stopped at hundreds and thousands at the same time and paid to the dealer who used them. And
However, ordinary detached houses, external construction work, or iron for buildings
200-day per day to add muscle spots and correct errors
If you ask a rebar processing specialist because it is relatively small at 400
Become expensive. Or there is a lot of processing for site adjustment,
Must cut and bend according to the actual thing at the site where it is assembled
For example, Japanese Patent Application Laid-Open No. 56-144826
Cutting and bending using the cutting and bending tool described in the gazette
Was. This cutting and bending tool converts the rotation of an electric motor into multiple gear trains.
Decelerates to transmit to the output shaft, and the eccentricity formed on the output shaft
Piston shape with a cutting blade attached to the tip at the maximum diameter of the cam
Press the slider to cut the rebar and on the same output shaft
Take a crank-shaped arm with a bending roller attached to the end.
Attach and rotate the arm to bend the rebar. However, in this cutting and bending tool, the present invention is aimed at.
Embody a small, lightweight, portable, low-cost bending tool that points to
Has the following further improvements. That is, (1) the cutting force for cutting the rebar is, for example, 13 mm in diameter.
The value is as large as 56000N for the reinforcing steel.
Has no boosting effect, so the eccentric cam is
The pushing force to push the roller is 56000, which is the cutting force itself.
N is required, and the eccentric cam and the output shaft
Gears that are large and heavy to maintain, and drive this
Rows and electric motors also become large. (2) The cutting eccentric cam and the bending arm are separated from each other.
Since it is composed of body, it is necessary to make each as a separate part
Eccentric cam thickness
And the entire outer frame becomes larger,
It is unsuitable and the cost is high because it is made separately. SUMMARY OF THE INVENTION The object of the present invention is to
In order to eliminate the disadvantages of the conventional electric cutting and bending tool,
A portable electric bending tool ideal for on-site bending work
(3) problems to solve and to solve these problems
To solve the technical problem of (6) for realizing a new structure
It is to be. (1) Problems to be solved by conventional electric cutting and bending tools
The same cutting force is obtained by reducing the size of the
Do you want to Relatively expensive machined parts such as cams and arms
To make it small and low-priced by sharing? (2) How small the output is by devising the shape of the cam rolling surface
The shaft drive torque generates a greater force, and
The machine and body to be smaller and lighter? (3) When rebars are processed on-site at the spot,
Manual rebar bending work described in Japanese Unexamined Patent Publication No. 53-43873.
Tools are used. Look at the bending angle with your eyes
The convenience of these hand tools that bend while adjusting
Is it realized by electric crab? (4) Carry the body to the position where you want to cut and bend,
A hand-held dual-purpose machine that allows easy switch operation while holding
A tool that can be lifted up to the rebar after standing and used for additional machining
provide. (5) Electric cutting and bending that can perform both cutting and bending
The length of the lay on the ground is a tool layout challenge
When bending or cutting heavy reinforcing bars, how
Do not use any effort such as standing upright and swinging.
Easy to cut and bend just by lifting the body slightly
To be able to do (6) With the conventional stationary bending tool, the main body is heavy and stable,
Although there was no need for the operator to hold the main unit,
As a solution, if you reduce the size and weight so that you can hold the main body,
Some kind of body holding means is required. As a solution to this
When bending, hold the handle with one hand to switch
Operate and use the other hand to bend the rebar into the receiving pin and the center pin
When fixing to the appropriate position, use a bending pin from 0 degree
The free end side of the rebar that turns while being bent to 180 degrees
Do not touch workers? (7) The upward or lateral end of the reinforcing bar already installed
How stable and easy to hold the body during bending
Or? (8) The output shaft shared by the cam and the bending pin is rotated by a predetermined angle.
It is necessary to return at the place where
Rebar in response to unexpected situations such as
Bends more than 80 ° and becomes useless,
How to protect it from damage and so on. [0007] To achieve the above object
Means of the present invention are as follows in the order of the above problems.
You. (1) Use of levers to reduce cam roller push-up force
The number of parts by devising the cam and the arm arm The bending pin is integrated at a position eccentric from the axis on the side of the cam
Form and share the arm with the cam. In this case, the bending pin
Has a cantilever structure with respect to the output shaft bearing, but
To place it at the pin position, push up the cam roller further.
And reduce the force applied to the output shaft bearing by the following method.
Need to be reduced. That is, the outer periphery of the cam rolls
Blades at both ends for cutting cam rollers and rebar
At the same time, a swing arm with a support shaft is provided in the middle part,
(Leverage ratio Kt = distance between cam roller and spindle: spindle and off
The distance between the cutting blades = several times), the cutting blades are moved up and down with strong force
Is provided with a cutting mechanism for swinging. With the action of leverage on the arm
The force to push up the cam roller is reduced to a fraction, and cantilevered
Not only can the load on the cam bearing be reduced, but also the cam rotation torque
The size of the main body can be reduced because the load can be reduced. (2) In rebar cutting, is the pair of upper and lower cutting blades open?
Almost no force is needed until closing and starting cutting,
The load gradually increases with the start of cutting, and when cutting is complete
In both cases, the load drops, and then feed in for further
There is a load characteristic that completes cutting. Using this characteristic, output
The distance from the center of the shaft to the outer circumference is a. Rapid traverse surface with rapidly increasing radius b. Almost sector shape with at least two greatly different curved surfaces of a cut surface with a gradually increasing radius (pressure angle of 80 degrees or more)
-Shaped cam, and the idle feeding until the movable cutting blade closes is quick.
Fast-forward on the feed surface a, and after cutting, match the load characteristics.
The cam with the cut surface b that gradually increases the radius of the cam
Push up the roller. In the cutting plane b, in the cam rotation direction
Even when only a small force is generated, a gentle slope
The wedge action of the cutting surface b, depending on the setting of the pressure angle, the radius
In the direction, there is a boosting action that generates a large force of about 4 to 6 times.
You. This boost factor Kc is determined by the curvature of the cam curve.
Can be set arbitrarily. Therefore, less cam drive torque
Large push-up force to reduce body size and weight
it can. Further, the cam roller is pushed up by this force,
With the leverage ratio Kt to the support shaft of the shaft, the cutting blade is sufficient for cutting the rebar.
It can generate powerful power. Depending on the setting of the cam curve
Required to generate a force in the direction of rotation of the cam at the time of
The torque is the torque required to bend the rebar with bending pins.
Can be set relatively freely to close ones. That is, the driving of the output shaft necessary for cutting and bending is performed.
Since the dynamic torque is almost the same value, the electric motor, reduction gear,
The electric motor is used for either cutting or bending by sharing the outer frame
Minimum size in a well-balanced manner without increasing the size and gears
I can make it. (3) Continuously variable speed In order to approximate the conventional manual operation feeling, pull the trigger
Adjustable motor speed from low to high speed
Set the speed control switch as the main switch
You. This allows you to adjust the trigger, and if you pull hard, it will turn faster.
Roll and pull lightly to rotate slowly, so bend the angle
Turn slowly at a very low speed while looking at the hand, subtly bending angle
You can control the degree. (4) The weight of the main body including the handle position and all of the motor with built-in switch, speed reduction section, and cutting and bending mechanism section
A hand that can be held with one hand as close as possible to the position where the heart hangs
The handle (or fingers while holding the handle).
Within the reach of the motor) to control the starting and stopping of the motor.
Place the switch. This allows the body to be
Can be supported and can be easily moved
Switch with your hand holding the handle while lifting the main unit.
Can be operated at the cutting point or where you want to bend.
While holding the main unit and applying, hold it in-kind
Can work. (5) Two-way stand When using both cutting and bending, set the cutting blade axially horizontally.
Stand that can stably place the main unit on the ground (or
Foot or similar stationary structure) and bending of the bending mechanism
The plane formed by the three pins, the pin, the receiving pin, and the center pin,
Stabilizes the body so that it is parallel to the rebar placed horizontally on the ground
Stand in the ground on the ground, can be used in two directions
Position where the two stand directions are almost perpendicular to each other
Establish a relationship. This allows the main unit to be
When placed on the ground, rebar placed parallel to the ground
Hold the cutting blade by horizontal movement without standing
Expires. When bending, hold the handle and
Just lean it up to 0 degrees, and the latter stands to ground the main unit
If you place the rebar in a vertical position
Place it on the cover with horizontal movement without bending
Can do work. (6) Handle and switch on the side where the free end of the rebar moves away
To the rebar fixed on the line consisting of the receiving pin and the center pin.
Switch on the side where the free end of the
And a handle containing a switch. Soshi
The operator stands on the side of the handle with respect to the main body, and
Hold the handle with the right hand on the receiving pin side of the reinforcing bar.
The free end side of the bent rebar (pivoted about the center pin)
The moving side) is moving away from the worker.
Workers do not touch the free end of the work. (7) In addition to the handle at the top of the main body, is it 90 degrees across the main body?
Another handle is provided in parallel at 180 ° symmetrical position
The body can be held with both hands across the center of gravity, and the body can be held in various directions
To bend by hand. (8) Since the bending of the rebar is 180 degrees or less, the cutting mode
Output shaft rotation angle position at bottom dead center of cutting blade
Is slightly larger than the 180 degree position of the bend.
The output shaft does not rotate beyond the rotation angle.
What is necessary is just to provide a stopper against the rocking arm. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing an embodiment of the present invention;
The present invention will be described with reference to the accompanying drawings. (Overall arrangement) In FIG. 1, a series-wound commutator motor 1 is built in.
From the resin housing 6
Over the gear cover 14 made of Lumi alloy die-cast
Is a plastic handle used for carrying and switch operation
46 is arranged substantially parallel to the axis of the electric motor 1. hand
46 is a hollow split structure with a main switch 4 inside.
1 and a relay 62, a timer circuit 63, etc.
While supporting with the handle 46,
Gas operation is possible. The power cord 48 is
Cuts out at the end opposite to the gear cover 14
It does not get in the way when working or bending. (Power supply circuit, switch and return control unit) FIG. 12 shows the present invention.
It is a circuit diagram of a cutting bending tool. A from power cord 48
C100V commercial power is supplied. Power supply is normally closed contact
Relay 62, main switch (speed control
A current is supplied to the electric motor 1 via the switch 41. Sole
The solenoid coil 37 is connected in parallel with the
It is turned on / off in conjunction with the operation of the switch 41. Electric motor
1 is a triac, etc., depending on how the trigger is pulled.
The phase control terminal 41a that changes the supplied electric energy by the phase control
Connected, and the solenoid coil 37
Output terminal 41b that directly outputs the power supply voltage regardless of
Connected to. ON / OFF of the relay 62 is a limit switch.
Switch 34 and the timer circuit 63. This circuit
Means that the limit switch 34 is normally off and the relay 62
Is turned on and the timer is activated when the limit switch 34 is turned on.
Shut off relay 62 for 3-5 seconds set by circuit 63
State, and during this time the main switch 41 trigger is pulled.
The motor 1 and the solenoid coil 37 from the power supply.
It has the function of turning off. (Power section) The electric motor 1 in the housing 6
Armature 3, brush 4, commutator 5, etc. located inside 2
It rotates at a high speed of 20,000 revolutions per minute. (Deceleration mechanism) At the tip of the armature 3, a first pini
On 7 is provided, and the speed is reduced to about 1/13 with the first gear 8
You. Similarly, at the next second pinion 9 and second gear 10, about 1 /
10, the third pinion 11 and the final gear 12
8 and finally to about 1/1000 with a three-stage gear train
The output shaft 13 is decelerated and the output shaft 13 is driven at a full speed with no load at a speed of about 20 revolutions per minute.
Spin at high speed. These gear trains are stored in the gear cover 14.
Have been. Although a spur gear train was used,
Other gears such as a car, bevel gear, and planetary gear may be used. (Tip mechanism) A gear cover 14 is provided at the tip of the housing 6.
Are screwed (not shown). Gear cover 14
With a split structure, the three-stage spur gear trains 7 to 12 are inside.
It is fastened with storage bolts (not shown). Gear gear
A fixing member 19 is fixed outside the bar 14 (left side in FIG. 1).
1 and the swing arm 21 on the left side of the fixing member 19 in FIG.
It is rotatably fixed through the intermediary. Figure from fixing member 19
A cam 18 is integrally provided with the output shaft 13 projecting to the left
Have been killed. From the cam 18, the swing arm 21, the fixing member 19, etc.
Further on the tip side (left side in FIG. 1) of the cutting mechanism section
-49 and the rotating cover 50, and the outside (left side in FIG. 1)
From the vicinity of the maximum radius of the cam 18
Bent pin 16 and output shaft 13 extending from output shaft 13
Center pin 27 of the body, receiving pin 35 protruding from fixing member 19
Is provided. That is, a fixed portion is provided on the left side of the gear trains 7 to 12.
On the left side of the material 19 and the fixing member 19,
To the left side through the rotating cover 50 and the cover 49
Four-layer structure in which pins 16, receiving pins 35, and center pins 27 are arranged
It has become. The housing 6 has an L-shape from the lower part to the rear part.
A stand bent approximately 90 degrees (the bottom stand 51 and the
Gear stand 14 is integrated with the gear cover 14 and the housing
Screw 6 (not shown). Figure 1
When viewed from the side as shown in FIG.
14, the cutting and bending mechanism on the left, and the bottom
Tom stand 51 and tail stand 52 on the right, top
The handle 46 is disposed at the front as viewed from the front as shown in FIG.
In this case, the bottom stand 51
Lower around the center pin 27 of the central output shaft 13.
The range of movement of the bending pin 16 in a semicircular shape on the side and the escape hole of this
The cover 49 has an arc-shaped long hole 49a.
The fixed cutting blade 24b is disposed on the
Is placed. In this embodiment, the arrangement of the cam 18 and the swing arm 21 is
Is a mirror image with the top and bottom as axes, and the fixed cutting blade 2
4b may project to the upper left side. Han
Bottom stand on the opposite side of the dollar 46 with respect to the center of gravity
The handle 51 has a shape of two rods, and a grip 47 is provided.
(See Fig. 1)
You. The stand 51 is made of iron as in this embodiment.
It can be made of sticks, bent steel plates, or
Resin or aluminum integrally with the housing 6 or the gear cover 14
Even if it is made by molding with Rumi die casting, or only the feet are put out,
The effect is the same if the main body can be placed horizontally or vertically
The form is not limited. (Cutting mechanism) In FIG.
The bearing 65 is press-fitted, and the final gear 12 is
The rotation is stopped, and the cam 18 contacts the output shaft 13 as described above.
Provided on the body. The outer shape of the cam 18 is as shown in FIG.
The rapid traverse surface 18a, whose radius rapidly increases from the center, slowly
Return that connects the cutting surfaces 18b, 18a and 18d with increasing radius
It has an almost fan shape composed of three surfaces 18c
I have. The final gear 12 of the output shaft 13 and the cam 1
The shaft between 8 can rotate on the boss 19a of the fixing member 19.
And the fixing member 19 is bolted to the gear cover 14.
(Not shown), and the output shaft 13 is connected to the boss 19a.
Both ends are supported by a bearing 65. In FIG. 3, a support is provided above the fixing member 19.
There is a swing arm 21 rotatably fitted by a shaft 20.
A cam roller 22 is rotated by a needle 23 at one end of the swing arm 21.
It is fixed to be rollable. Cut a reinforcing bar at the other end of the rocking arm 21
The movable cutting blade 24a to be cut is fixed with the set screw 25.
You. Also fixed to the fixed member 19 facing the movable cutting blade 24a
The cutting blade 24b is fixed with a set screw 25. Cutting blade
24 blade portion 24c is not a flat surface,
It has an arc shape close to a semicircle with a large diameter. (Bending mechanism) In FIG. 1, with a maximum radius portion of the cam 18
A boss that is wider than the rolling surface of the cam 18 is provided near 18d.
There is a hole in the boss, 15mm in diameter, 40mm in length
mm bending pin 16 is press-fitted and fixed (bending pin 16).
The press-fitting of the cam 16 is performed when the cam 18 is cut.
It takes a lot of man-hours to cut a bar-shaped pin at an eccentric position.
This is to significantly increase the unit price, and give priority to strength.
If it is, it may be one. The boss was made thicker
The strength of the hole withstands the bending moment applied to the pin 16
In order to be able to do so). Bending pin 16
Roller 66 is fitted rotatably and pulled out with a stop washer 67.
It is stopped. On the axis of the output shaft 13 is a cam 18
The center pin 27 protruding outward is formed integrally.
(The diameter of the center pin 27 is 26 mm in this embodiment.
However, this is because the inner bending radius R of the 13 mm
It depends on the R of the bending to be set.
). 80 m above the boss 19a of the fixing member 19
A hole is provided at a distance of about m, diameter 15 mm, length 6
A receiving pin 35 of about 0 mm is press-fitted and fixed (receiving pin 3
5 is press-fitted when the fixing member 19 is cut.
It takes a lot of man-hours to cut a bar-shaped pin at an eccentric position.
This is to significantly increase the unit price, and give priority to strength.
If it is possible, the receiving roller 36 rotates on the outer circumference
It is secured with a stop washer 68 if possible. Bending roller
66 and the receiving roller 36 are not merely cylindrical,
It has a concave drum shape (see FIG. 22). The receiving pin 35 is made of steel instead of the gear cover 14.
The press-fitting into the fixing member 19 made of the material
Receiving bending moment applied to 5 by fixing member 19
To ensure the strength of the hole easily.
It is necessary to make the cover 14 thick and to provide reinforcing ribs.
There is no need to increase the size. Cover and rotate the support shaft 20
It extends to the outside of the rolling cover 50, instead of the receiving pin 30
It is also possible. (Bending angle adjusting mechanism) Diamond is applied to the end face of the center pin 27.
The dial 28 is rotatably held, and the concave
The protrusions 30 are provided approximately every 11.25 degrees,
Moderation is provided in the rotation direction by a spring 32. FIG.
, Extends from the dial 28 through the output shaft 13.
At the rear end of the rod 31a, a projection 33 protruding in the radial direction is provided.
Is mounted, and the output shaft 13 is
When rotated by the angle set by the dial 28, the projection 33
Is the limit switch 3 provided at the bottom of the gear cover 14.
4 is turned on. Left side of dial 28
Has a graduation indicating the cutting angle from 0 ° to 180 °.
(See Fig. 2)
Setting the desired bending angle (0 to 180 degrees)
Mode of cutting and cutting (10 degrees from 180 degrees of bending angle)
Approximately, the swing arm 21 is fully raised, and the movable cutting blade 24a is
This is the position where the bottom dead center is reached, and this is called the cutting mode.
(Cam 18 is the initial position in FIG. 9)
Start bending from a position clockwise about 50 degrees from this
The position is set to 0 degree on the dial 28, and it is further advanced by 180 degrees.
The position of 230 degrees is 180 degrees of bending and advances by about 10 degrees
The position at about 240 degrees is the cutting position.) In FIG. 16, the first gear 8 is a second pinion.
The first gear 8 is rotatably fitted to the
A spring that straddles the outer periphery of the shaft portion 9a of the 2-pinion 9
The clutch 15 is wound without any interference. S
At one end of the pulling clutch 15, the end of the spring
Locking portion 15 with its end protruding about 8 mm in the outer peripheral direction
There is a. Spring clutch 15 is a piano wire wound left
And the sleeve 64 has the solenoid coil 37
When the sleeve 6 is pushed into the first gear 8 by the
When the engaging portion 15a engages with the groove 64a of the first gear 4, the first gear 8
Tries to turn the second pinion 9 counterclockwise,
The first clutch 8 and the second gear
The pinion 9 turns integrally. The bending pin provided on the cam 18
When the shaft 16 reaches the specified angle, the output shaft 13 is
Interlocks with the dial 28 that rotates together with the force of the ball 2 and ball 31
Convex part 33 pushes the limit switch 34,
The switch 34 is turned on, and the relay
62 is turned off by the timer circuit 63 for 3 to 5 seconds. This
When the solenoid coil 37 is turned off,
The retractor 37a is retracted, and the sleeve 38 is moved by the spring 38.
64 moves away from the boss 8a of the first gear 8. in this case,
The motor 1 is also turned off, but is still running due to inertia and
Even if the gear 8 is rotating, the spring clutch 15
In order to loosen sometimes and return to the floating state from the shaft 9a, the second
The rotation is not transmitted to the pinion 9 and the output shaft 13 stops rotating.
You. The clutch using the spring clutch 15
But the other examples are claw clutches and buttons.
Clutch, friction plate clutch, electromagnetic powder clutch
Etc. can be engaged and disengaged by an electric signal
Is also good. (Return mechanism) Recess on the left side of the final gear 12
12a is provided with a torsion coil spring 60,
With the restoring force in the direction opposite to the driving direction from the motor 1.
It is energizing. In the recess 12a of the final gear 12.
Built-in final coil spring 60 enables final gear 1
2 and the axial length of the tool body can be reduced. Next, regarding the operation of the bending tool of the present invention, cutting will be described.
Each of the bending will be described. (Cutting work) Reinforcing bar 69 lying on long ground of about 5m
In most cases, the reinforcing bar 69 parallel to the ground is fixed and cut.
To make it easier to apply to the cutting blade 24b, as shown in FIG.
The main body is placed so that the bottom stand 51 contacts the ground.
Thereby, the shaft of the output shaft 13 and the blade portion 24c of the cutting blade 24 are formed.
You can place your heart horizontally on the ground. Next, pull the handle 46 with your right hand
Hold the switch 41 and operate the reinforcing bar 69 with your left hand.
Apply to the blade portion 24c of the fixed cutting blade 24b that is open
(See FIG. 6), the reinforcing bar 69 remains horizontal to the ground.
Get ready for cutting work. At this time, dial 28 is turned off.
It is assumed that it is set at the cutting position. What is the cutting position?
The cam 18 rotates clockwise the most and the cam roller 22
Do not touch it near the maximum radius 18d of the cam 18.
That is, the swing arm 21 is lifted most and the movable cutting blade 24a is
It is in a state of reaching the bottom dead center (see FIG. 8). Next, the trigger of the main switch 41 is pulled.
When the radius R of the cam 18 suddenly increases, the cam roller 22
It is rapidly pushed up by the feed surface 18a, and the movable cutting blade 24a
Starts to cut from the open state where the rebar 69 can be inserted
(See FIG. 6).
8 means the distance from the rotation center to the contact point P). Fast-forward surface
18a is an angle of about 20 degrees as viewed from the center of the cam 18.
The radius increases from 10mm to 35mm by 25mm.
It is a steep slope with a curvature close to a straight line. Movable on rapid traverse surface 18a
The cutting blade 24a is almost 0.2 seconds in a state of almost no load.
Close in time and move on to the next cutting process. This is the traditional hydraulic
Formula feeds a large amount of oil into the cylinder and moves a long stroke.
Significantly shorter than the time it takes to move. Next, the cam roller 22 has a radius R of the cam 18.
Cutting enters the gradually increasing cutting surface 18b and starts cutting. Off
The cross section 18 b has an angle of about 150 when viewed from the center of the cam 18.
Radius R is about 20mm from 35mm to 55mm in the range of degree
Formed by arc surfaces of different curvatures
It is a gentle slope. The torque acting on the output shaft 13 is represented by T
If c, the contact between the cam 18 and the cam roller 22 is
The force Fb acting in the circumferential direction of the point P is Fb = Tc / (contact
Radius R of the point P) and push the cam roller 22 in the radial direction.
The lifting force Fd depends on the gentle slope of the cam 18.
The value is 5 to 6 times as large as Fb due to the rust effect. This
This is called the boosting action of the program 18. The relation between Fb and Fd can be generally expressed by the following equation.
This is referred to as the boost factor Kc of the cam 18 (see FIG. 19). Kc = Fd / Fb = cos (X + tan
^-1 U) / cos (Y-tan ^-1 U) Here, X: pressure angle of the swing arm 21, Y: pressure of the cam 18
Angle, U: Coefficient of friction of cam roller 22. The above formula is a spindle
20 and the simplified formula omitting the effect of the friction coefficient of the output shaft 13
Yes, but the trend is the same as the exact formula. In this embodiment, X =
5 degrees and Y = 83 degrees are set, in this case, boost
The rate Kc is a value around 6. The cutting load Fc of the reinforcing bar 69 and the movable cutting blade 24
The relation of the stroke δ of a changes as shown in FIG. So
Here, the rise of the load at the beginning of cutting is slightly smaller than Y.
And set Kc to a smaller value, and set Y at the peak of the load.
Maximize and maximize Kc, and under the load at the end of cutting
At this point, set Yc slightly smaller and Kc smaller.
You. This is due to the cutting load Fc that changes at the stroke position.
For the value of the pushing force Fd proportional to this, a limited
A larger value of Kc where needed within the radius R of the cam 18
To minimize changes in the output shaft 13 force Fb and torque Tc.
The drive torque Tc is thus reduced.
Lower peak value and drive efficiently with small motor 1 and gears
it can. For this reason, the cut surface 18b of the cam 18 has the same
Even on a surface where the radius R changes gently, the cam 18
Of a plurality of arcs having different curvatures so as to change the pressure angle Y of
It is composed of a combination. With respect to the force Fd for pushing up the cam roller 22,
And the force F acting on the movable cutting blade 24a via the support shaft 20
c (this is the cutting force) between the cam roller 22 and the support shaft 20
The distance Lr, the distance Ls between the support shaft 20 and the movable cutting blade 24a,
It is boosted by leverage determined by the ratio, and this is the leverage boost factor Kt
That. In this embodiment, Kt = Lr / Ls = 60 mm / 30 mm = 2 Therefore, for example, when cutting a reinforcing bar 69 having a diameter of 13 mm, a bar cutting force Fc = 56000N a pushing-up force of the cam 18 Fd = Fc / Kt = 56000/2. = 28000N Rotational force of the cam 18 Fb = Fd / Kc = 28000/6 ≒ 4660N
I understand. That is, the boosting action of the cam 18 and the lever makes 1
Double cutting force can be generated. The torque of the output shaft 13 at this time
Approximately 18 mm when the radius of the contact position of the cam 18 is 40 mm.
6 Nm. Therefore, the reinforcing bar 69 is 186 N of the output shaft 13.
m torque is 56000N due to the boost action of the cam 18 and lever
m and cut. As shown in FIG. 3, the cutting blade 24c is made of iron.
It has a semicircular arc shape with a diameter larger than the outer diameter of the streak 69
However, this means that the swing arm 21 swings about the support shaft 20.
In this case, because this moves in an arc instead of a parallel movement,
The property that the force acts on the muscle 69 in the direction away from the support shaft 20
To prevent the rebar 69 from escaping against this.
The shape is For example, when performing a 180-degree bending in a bending operation.
If you set 180 degrees with the dial 28, the cam 18
Start from the initial position (Fig. 9) and turn clockwise in the figure.
Start bending from a position rotated about 50 degrees, and then 180 degrees
The U-shaped bending is completed at a position at 230 degrees where the bending is advanced.
In the case of cutting, it is movable cut at a position of 240 degrees, which is further advanced by 10 degrees.
The cutting blade 24a reaches the bottom dead center, and the cutting ends. Above
As shown, the swing arm 21 is on the same level as the cam 18 and
When the cam 18 rotates more than 250 degrees, the maximum radius of the cam 18 becomes 1
8d part collides with rocking arm 21 and cannot rotate any more
Has become. For this reason, for example, it is assumed that a 180-degree bending is performed.
If you accidentally set the disconnect mode,
The difference in the rotation angle of the cam 18 between the 0 degree bending and the cutting is only 10 degrees.
The bent rebar 69 crosses and becomes useless
No such troubles occur. Also limit switch
Even if 34 fails, the cam 18 and the swing arm 21 collide and 250
Since it does not turn more than degrees, the rebar 69 bent as above crosses
There is no problem such as becoming unusable. (Return after cutting) As described above, the cam 18 rotates 360 degrees.
The rotation angle set by the cam 18 is
After the end of rotation, it is necessary to reversely rotate and return to the original initial position.
The convex portion 3 in which the limit switch 34 is connected to the dial 28
When it is pressed and turned on at 3, the timer circuit 63 linked to this is turned on.
Turns off the relay 62 for 3 to 5 seconds. As a result, the electric motor 1
And the power supply to the solenoid coil 37 is instantly stopped.
You. Motor 1 has inertia, so a few seconds after power off
While the solenoid coil 37 is turned off and
The transmission of rotation from the first gear 8 to the second pinion 9 is interrupted.
Therefore, the rotation of the output shaft 13 stops instantaneously. On the side surface of the final gear 12 on the cam 18 side
By the torsion coil spring 60 in the provided concave portion 12a
The final gear 12 is always urged in the reverse rotation direction,
Force in the direction of returning to the initial position on the
Clutch 15 is connected and the output shaft 13 rotates
Indicates that the output shaft 13 is in the reverse rotation direction of the torsion coil spring 60.
The cam 18 is turned against the torque).
From the final gear 12 by the restoring force of the coil spring 60
The deceleration unit up to the second pinion 9, the output shaft 13, and the cam 18
Rotate in the reverse direction, the initial position of the cam 18, ie, the minimum
The cam roller 22 comes into contact with the radius position (see FIGS. 6 and 9).
State), the movable arm 21 is pulled back by the spring 26 and is movable.
The blade 24a stops in the most opened state. Initial stage of cam 18
At the position, the maximum radius 1 into which the bending pin 16 of the cam 18 is press-fitted.
A return slope 18c close to 8d is formed on the boss 21a of the swing arm 21.
Abut, and this will act as a stopper, and
No. This is because the cam 18 and the swing arm 21 are moved from the fixing member 19 in FIG.
This is an effect that is placed on the same surface on the middle left side,
The movable cutting blade 24a is always in the most open state without applying
The reinforcing bar 69 to be cut next is cut by the cutting blade blade portion 24c.
Can be inserted from the side, and the bending pin 16
Rebar 69 retracts to a position where it can be set and stops stably.
Can be (Return when the main switch 41 is turned off during disconnection
What has been explained above is that cutting (or bending) is complete.
To return when the limit switch 34 is actuated.
However, for example, to interrupt the work for some reason on the way
When the main switch 41 is turned off, the motor 1 and the solenoid
The power supply of the solenoid coil 37 is linked with the main switch 41.
And the transmission of rotation is interrupted and the cam 18
The pin 16 is restored by the restoring force of the return coil spring 60 as described above.
Return to (After the limit switch 34 is activated, the main switch 41
Return when not turned off) Limit switch 34 operates
Then, the power is turned off via the relay 62 and the return
As explained in the previous section, if the main switch 41
Inconvenience occurs if you hold it without releasing the trigger
I do. That is, the output shaft 13 rotates reversely when returning,
The protrusion 33 is separated from the limit switch 34
The switch 34 is turned off again, and the relay 62 is turned on.
Here the main switch 41 remains on
Motor 1 rotates again, and the spring clutch 15 rotates.
Start rotation transmission, cam 18 rotates forward and return
I will refuse. Therefore, in this embodiment, the limit switch
Switch 34 is not directly turned on / off
Once switch 34 is actuated, relay 62 for 3-5 seconds
Provided a timer circuit 63 so that the
During the return stroke, even if the limit switch 34 is turned off.
Time to return to initial position, motor 1 or solenoid coil
The rule 37 is not operated. 3-5 seconds
Time is easy for the operator to notice the end of the bend or cut
Release the trigger of the main switch 41 with plenty of time.
This is the value set as the time required for (Bending work) Next, the bending work of the reinforcing bar 70 will be described.
You. In FIG. 14, the handle is turned from the disconnected state.
Rotate the main body 90 degrees while holding the tail stand 5
2 is placed on the ground, and the cover 4
9 and the bending mechanism are in the upper surface. Dial
28 is set at the scale position of the desired bending angle,
Place the 70 on the cover 49 and level the rebar 70 with your right hand
Hold the handle 46 with the left hand and grasp the handle 46 with the left hand.
Operate the main switch 41 and place the reinforcing bar 70 on the ground with your right hand.
And hold it horizontally (see FIG. 14). Next
When the trigger of the main switch 41 is pulled,
In this state, the limit switch 34 does not operate yet.
Relay 62 is in the ON state and the current is
Ray 62, the phase control terminal 41a of the main switch 41,
The current flows to the armature 3 via the field coil 2, and the motor 1
It rotates at the speed adjusted by the pull of the moth. solenoid
The coil 37 is triggered by the main switch 41
At the same time, the power supply voltage is supplied from the output terminal 41b,
It turns on strongly regardless of how well the
Plunger 37a resists the force of spring 38
And the sleeve 64 projects toward the first gear 8 side.
To the locking portion of the spring clutch 15 in the groove 64a.
15a meshes. The sleeve 64 corresponds to the second pinion 9.
Splice that can move in the axial direction but not in the rotational direction
The first gear 8
By rotating, the spring clutch 15 tightens in the direction of your choice
The first gear 8 and the second pinion 9 are firmly integrated.
The rotation is transmitted to the output shaft 13 and the cam 18 rotates.
Here, the main switch 41 is strongly pulled by the pull of the trigger.
Rotation of the motor 1 so that it turns faster when you pull it weakly and slowly when you pull it weakly
Speed control function built-in switch that can change speed
Switch, so you can work slower or faster
It can be tricky. To the solenoid coil 37,
Since the power supply voltage is supplied regardless of how the Riga is pulled,
There is no problem such as weakening of the suction force of the plunger 37a. The bending pin 16 on the cam 18 is located on the right side in FIG.
To move to the left and right side from the tip of the reinforcing bar 70 to be bent
70b is for the person away from the worker located on the handle 46 side
Direction (see FIG. 14), so that the moving tip
There is no risk of contact. In FIG. 9, the reinforcing bar 70 is
In the rotation direction by the receiving roller 36 and the center pin 27 of the
Bending pin that is held down and rotates around the center pin 27
With 16 bending rollers 66, the output shaft rotates clockwise from the right side in the figure.
13, the rotation torque of about 150 Nm
The machine load is slightly smaller than the motor load during cutting work,
The rotation torque of the output shaft 13 is slightly smaller than during the cutting operation.
At any angle along the center pin 27
It is bent (see FIGS. 10 and 11). Where the bending pin
Rollers 66 and 36 with large outer diameters
It is provided between the reinforcing bar 70 and the pins 16 and 35 at the time of bending.
Is reduced by the rotation of the rollers 66 and 36.
In order to bend with a small torque.
Therefore, the rollers are on the center pin 27 and the bending pin 16,
The effect is the same even if it is not provided on the receiving pin 35. Also received
The pin 35 is a cylindrical pin, and the outer roller is circular.
The cross section is a foreign matter between the reinforcing bar 70 and the receiving pin 35.
(For example, short chips of the reinforcing bar 70)
Therefore, when the force is applied, it will come off easily, so the bending angle
There is no malfunction such as going out of order. Also, as shown in FIG.
Rollers 66 and 36 are not simple cylinders, but have large central ends
(Minimum diameter part is the root of pins 16 and 35)
The bending module acting on the cantilevered pins 16 and 35 is closer to the side.
Is even better). this is,
Unstable and unsteady when the body is lifted up in the air and bent
Reinforcing bars 70 do not come off rollers 66 and 36,
Reinforcing bar 70 so that it can be held near the roots of
This is a device for inserting into the concave portions of the rollers 66 and 36. For example, bending a reinforcing bar 70 having a diameter of 13 mm
Required for the output shaft 13 is about 150 Nm.
This is the torque 18 at the time of cutting described in the cutting mechanism.
The value is slightly smaller than 6 Nm, but approximately close. this is
The power factor Kc of the cam 18 and the power factor Kt of the lever at the time of cutting
Achieved by the husband, when bending and cutting
The torque of the output shaft 13 is about 0.7 to 1.5 times
If there is, for example, gears, heat treatment without changing the dimensions
Gears that can withstand this can be manufactured by using
The motor 1 has the same size and winding specifications and rotation
Can be changed by changing the number, either cutting or bending
Range where there is no need to increase the gear or motor 1
It is. As a result, the sizes of the motor 1 and the gears are also balanced.
You can choose the least and lightest thing. Also for cutting
The swing arm 21 and the bending pin 16 for bending always move at the same time.
Switching between bending and cutting work
Just change the direction of the set of 28 and the main body
Very simple. And always power from the same output shaft 13
The large torque is switched between cutting and bending
No mechanism, light weight and low breakdown
High reliability. As shown in FIG. 15, the existing upward or sideways iron
When bending the upper end of the streak 70, use the bottom stand
While holding the body weight with the grip 47 of 51
Then, adjust the direction with the handle 46
Operate the in-switch 41 and bend the main unit in a stable state.
Can be The process of stopping and returning after this is the same
Since they are completely the same, the description is omitted. In the above embodiment, the reinforcing bar is used for bending
It is assumed that the bending pin 35 receiving the reaction force of 70 is provided independently.
However, as described above, the support shaft 20 projects outward from the cover 49.
And the projection of the support shaft 20 is also used as a receiving pin.
In this case, the configuration can be simplified and the cost can be reduced
It is possible to provide a simple cutting and bending tool. Also 13mm
Cut or bend the rebar, but no more
It is clear that it can also be used for 16, 19, and 22 mm rebar.
In this case, the electric motor 1 and the gear trains 7 to 12 are suitable.
It may be set appropriately. Further described as a cutting and bending tool
The rocking arm 21, the cam 18, the cutting blades 24a, 24b, etc.
Of the output shaft 13
The same applies to a bending machine with a bending pin 66 at the eccentric position.
Various effects can be obtained. As described above, according to the present invention,
The following effects can be obtained. (1) Speed can be changed by pulling the switch.
Set the speed control switch to
Since it is stored in a handle, place heavy workpieces such as rebar
While holding the main body with the handle, pull the trigger
Bend slowly while looking at it, and trigger when you want to stop
Can be stopped immediately by returning it, and it feels like a manual tool
Good workability. (2) Hand with built-in bending mechanism pin and switch
The tip of the material being bent and moved
The edge moves in the direction away from the worker, so transfer the workpiece.
The moving tip does not touch the operator. Book at work
It is necessary to hold the body and operate the switch.
Built-in handle must be used for holding and operating
Side, and the position of the worker
The effect is more certain because of the definition.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cross-sectional view showing an embodiment in which the present invention is applied to an electric cutting and bending tool. FIG. 2 is a front view of FIG. 1; FIG. 3 is a front view showing a state where a cover and a rotating cover of FIG. 2 are removed. FIG. 4 is a perspective view of FIG. 1; FIG. 5 is a perspective view showing a usage example of a reinforcing bar used for a foundation or an exterior of a house or the like. FIG. 6 is a front view showing the operation of the cutting mechanism of the cutting and bending tool in FIG. 1; FIG. 7 is a front view showing the operation of the cutting mechanism of the cutting and bending tool shown in FIG. 1; 8 is a front view showing the operation of the cutting mechanism of the cutting and bending tool shown in FIG. 1; FIG. 9 is a front view showing the operation of the bending mechanism of the cutting bending tool in FIG. 1; FIG. 10 is a front view showing the operation of the bending mechanism of the cutting bending tool in FIG. 1; FIG. 11 is a front view showing the operation of the bending mechanism of the cutting bending tool shown in FIG. 1; FIG. 12 is a circuit diagram showing an electrical connection of the cutting and bending tool of FIG. 1; FIG. 13 is a perspective view showing an example of a cutting operation of the cutting and bending tool in FIG. 1; FIG. 14 is a perspective view showing an example of a bending operation of the cutting bending tool in FIG. 1; FIG. 15 is a perspective view showing a bending operation of an existing upward reinforcing bar of the cutting bending tool of FIG. 1; FIG. 16 is a cross-sectional view showing a clutch part constituting the cutting and bending tool of FIG. 1; FIG. 17 is a perspective view showing a relationship between a limit switch and a dial. FIG. 18 is a partial sectional view showing another embodiment of a cam and a bending pin which constitute the present invention. 19 is an explanatory front view showing the principle of a cam booster mechanism constituting the cutting and bending tool shown in FIG. 1; FIG. 20 is a graph showing a relationship between a cutting load of a reinforcing bar and a stroke of a cutting blade. FIG. 21 is an axial sectional view of a cutting blade constituting the cutting bending tool of FIG. 1; FIG. 22 is an axial sectional view of a bending roller and a receiving roller that constitute the cutting bending tool of FIG. 1; [Description of References] 1 is a series-wound commutator motor, 6 is a housing, 7, 9, 11
Is a pinion, 8 and 10 are gears, 12 is a final gear,
13 is an output shaft, 14 is a gear cover, 15 is a spring clutch, 16 is a bending pin, 18 is a cam, 18a is a fast-forward surface, 18b is a cutting surface, 18c is a return surface, 18d is the maximum radius of the cam, and 19 is a fixing member. , 20 is a support shaft, 21 is a swing arm, 22 is a cam roller, 24a and 24b are cutting blades, 27
Is a center pin, 28 is a dial, 34 is a limit switch, 35 is a receiving pin, 36 is a receiving roller, 41 is a main switch, 46 is a handle, 47 is a grip, 48 is a power cord, 49 is a cover, 50 is a rotating cover, 51 is a bottom stand, 52 is a tail stand, 60 is a torsion coil spring, 62 is a relay, 63 is a timer, 66 is a bending roller, 69 is a cutting rebar, and 70 is a bending rebar.

Continuation of front page    (72) Inventor Hiroyuki Oda             1060 Takeda, Hitachinaka City, Ibaraki Prefecture Hitachi             Machine Co., Ltd. F term (reference) 4E063 AA09 BC04

Claims (1)

Claims: 1. An electric motor housed in an outer frame of a main body, a gear train for reducing the rotation of the motor, an output shaft driven by a final gear of the gear train, and an integral or integral part of the output shaft. An electric bending tool comprising: a center pin provided as a separate body; and a bendable workpiece that is bent by a bending pin that rotates around the center pin. A gear cover for storing the gear train and a cover for storing a fixing member and the like between the gear cover, a housing, a handle extending over the gear cover is provided, and a main switch for opening and closing a power supply path to the electric motor is housed in the handle. The main switch is a speed control switch that changes the amount of electric power to be supplied depending on how the trigger is pulled, and the handle is bent when the workpiece is bent. Range electric bending tool is characterized in that is located outside the.